@app.cli.command('shell', short_help='Runs a shell in the app context.')
def shell_command():
    """Runs an interactive Python shell in the context of a given
    Flask application.  The application will populate the default
    namespace of this shell according to it's configuration.

    This is useful for executing small snippets of management code
    without having to manually configuring the application.
    """
    import code
    from flask.globals import _app_ctx_stack
    app = _app_ctx_stack.top.app
    banner = 'Python %s on %s\nApp: %s%s\nInstance: %s' % (
        sys.version,
        sys.platform,
        app.import_name,
        app.debug and ' [debug]' or '',
        app.instance_path,
    )
    ctx = {}

    ctx.update(app.make_shell_context())

    try:
        from IPython import embed
        embed(banner1=banner, user_ns=ctx)
    except ImportError:
        code.interact(banner=banner, local=ctx)